Waste Management Inc. , headquartered in Houston, and the leveraged-buyout firm aPriori Capital Partners LP , Concord, Massachusetts, have announced the signing of a definitive agreement under which a subsidiary of Waste Management will acquire Deffenbaugh Disposal Inc. , Kansas City, Kansas. "This proposed acquisition aligns perfectly with our goal of driving shareholder value by maximizing our focus on our core business," says David Steiner, president and CEO of Waste Management.